"There doesn't seem to be any obvious test cell. Testqaitems does not exist in FONV. There are 7 containers (TestQAAmmo/Armor/Books/Misc/Potions/Repair/Weapons) that hold all the relevant items...but they aren't used anywhere in the game. You can try just placing the containers somewhere, though.

Maybe someone knows if there is an Items Test Room in the game, like in Fallout 3. In Fallout 3 u had to enter "coc TestQAItems" into the console and then u got teleported to the testroom where all weapons and armors where available.